Fix really obscure bug with IgnorePlugin
Fix really obscure bug with IgnorePlugin

Apparently the code before fixing its call args didn't do anything, but
with the fixed logic it breaks e.g. the burotel plugin in obscure ways
unless it's disabled for plugins...

indico/indico,DirkHoffmann/indico,indico/indico,DirkHoffmann/indico,indico/indico,DirkHoffmann/indico,DirkHoffmann/indico,indico/indico